Weighing-scale



(No Model.)

N; DU BRUL.

WEIGHING SCALE.

No. 299,758. Patented June 3, 1884.

Attes'? Inventor.-

Napalezm DUBJ'UZ UNITED STATES Farmer OFFICE...

NAPOLEON DU BRUL, OF CINCINNATI, OHIO.

WEIGHING-SCALE.

SPECIFICATION forming part of Letters Patent No. 299,758, dated June 3,1884.

Application filed January :25, 1884. (No model.)

T0 at whom it may concern.-

Be it known that I, NAPOLEON DU BRUL, of Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and useful Improvement in \Veighing-Scales, of which the following is a specification.

My invention-relates to improvements in those balance or weighing scales in which the torsional elasticity of metal or analogous material is employed to control theoscillations of the beam.

My improvements have for their object the production, at a moderate expense, of a torsion-balance of great sensitiveness and durability and of simple and cheap construction.

In another application, No. 118,691, I have shown, described and claimed, and applied to one form of scale a flat torsion strip, bar, or rod stretched horizontally and set up edgewise, to form a fulcrum strip, bar, or rod for the beam. In other applications, Nos. 118,693, 118,694, 118,695, and 118,979, I have shown and described the employment of such torsion strip, bar, or rod with other forms of scales. The present form of my invention has the beam extending in both directions, one end of the beam supporting a pan for the articles to be weighed, and the other end being graduated for a sliding weight.

In the accompanying drawings, Figure 1 is a perspective view of a weighing-scale embodying my present invention. Figs. 2 and 3 are respectively a vertical and a horizontal sec tion of the same.

A is a base or foot, upon which are two posts, B, in which slots 2) in pairs, one pair vertically above the other pair, receive the ends of torsion Strl])S, l Q2 1 S 0 l 1QlS C Q of steel or equivalent elastic material. These strips, bars, or rods, having been tightly stretched, are firmly secured in their respective slots by any suitable means, preferably by means of a screw, E, passing through a clamping-block, D. The posts B are the fulcrum-posts, and the strips, bars, or rods the fulcrum strips, bars, or rods. To each fulcrum strip, bar, or rod, at ornear its mid-length, there is attached, by similar clamping blocks and screws to those mentioned, a scale-beam, F, and a connectingbar, F, respectively, the scale-beam extending on both sides of the fulcrum strip, bar, or rod, for support on the respective sides of the plish the purpose.

weighing-pan and one or more sliding weights, as hereinafter explained. Each beam or bar F F terminates on the pan side' of the machine in a T-head or cross-bar, G, to whose portion of the beam F on the'side of the fulcrum strip, bar, or rod 0 remote from the pan is marked with a scale, L, and carries one or more sliding weights, M. The stem J, being prolonged downward, as shown, by its contact with the base, limits the oscillations of the beam occasioned by weight put in the pan.

The object of the combination of the beam or bar F and the torsion strip, bar, or rod secured thereto is to fasten the end of the pan-support in a perfectly vertical, and the weighing-pan consequently in a constant horizontal, position under every oscillation of the beam, which is of great importance in a weighing-scale.

The torsion strips, bars, or rods are in the present illustration shown as flat strips of metal having proper elasticity and flexibility to twist when the scale is oscillating; but I do not confine myself to this special form of bar, as any other shape of stretched strip, bar, or rod having the proper elasticity and applied in the manner shown will accom- My scale is furthermore susceptible of other modifications without departure from the characteristic features of the invention. For example, there may be two vertical pan-supports, to which the ends of the torsion strips, bars, or rods H may be fastened, and the beam and bar ends be fastened at midlengths of said torsion strips, bars, or rods. The fulcrum-posts of the beams and bars might be branched out to be fastened to the ends of the fulcrum strips, bars, or rods 0 C, while they could twist on a single post from the base fastened to the center of the torsion strips, bars, or rods. Knife edge fulcrumpivots could be used in place of fulcrum strips, bars, or rods 0 C, while the pan-support could be fastened to torsional strips, bars, or rods H, as shown.

I claim as new and of my invention- I pivoted Weight-beam, short connecting-bar,

1. In a weighing-scale, the combination of base, and a pan-support rigidly and directly fulcrum torsion strips, bars, or rods, scaleattached to torsion strips, bars, or rods rig- 15 beam, connecting-bar, sliding Weight on the idly and directly attached to the outer ends,

5 scale-beam on one side of the fulcrum, torof the weight-beam and connecting-bar, subsion strips, bars, or rods secured rigidly and stantially as set forth. directly to the pan ends of the scale-beam and In testimony of which invention I hereunto connecting-bar on the other side of the fulset my hand. crum, and a pan-support rigidly and directly NAPOLEON DU BRUL.

10 secured to the end torsion strips, bars, or rods,

substantially as set forth.

2. In a weighing-scale, the combination of Attest:

Gno. I-I. KNIGHT, S. S. CARPENTER. 

